Question

每当我保存一个领域对象时，我都会遇到崩溃，崩溃点是一个类型为SaleItemVariation的属性，它从Installing package into ‘/home/nomani/R/x86_64-pc-linux-gnu-library/3.4’ (as ‘lib’ is unspecified) trying URL 'https://cran.rstudio.com/src/contrib/cplexAPI_1.3.3.tar.gz' Content type 'application/x-gzip' length 404918 bytes (395 KB) ================================================== downloaded 395 KB * installing *source* package ‘cplexAPI’ ... ** package ‘cplexAPI’ successfully unpacked and MD5 sums checked checking for gcc... gcc -std=gnu99 checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc -std=gnu99 accepts -g... yes checking for gcc -std=gnu99 option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -std=gnu99 -E checking for cplex... NONE configure: error: CPLEX interactive optimizer not found ERROR: configuration failed for package ‘cplexAPI’ * removing ‘/home/nomani/R/x86_64-pc-linux-gnu-library/3.4/cplexAPI’ Warning in install.packages : installation of package ‘cplexAPI’ had non-zero exit status The downloaded source packages are in ‘/tmp/RtmpBEFSoC/downloaded_packages’设置nil。

RLMAccessor.mm

我的课程：

if (_promote_existing && [obj isKindOfClass:_info.rlmObjectSchema.objectClass] && !prop.swiftIvar) {
        // set the ivars for object and array properties to nil as otherwise the
        // accessors retain objects that are no longer accessible via the properties
        // this is mainly an issue when the object graph being added has cycles,
        // as it's not obvious that the user has to set the *ivars* to nil to
        // avoid leaking memory
        if (prop.type == RLMPropertyTypeObject) {
            ((void(*)(id, SEL, id))objc_msgSend)(obj, prop.setterSel, nil);
        }
    }

我不知道为什么会这样？

注意：Realm版本为final class SaleItem: Object, Mappable{ ..... @objc dynamic var variation: SaleItemVariation! ...... var singleQuantityPrice: Double { return variation.price // Crash here, Fatal error: Unexpectedly found nil while unwrapping an Optional value } } class SaleItemVariation: Object, Mappable{ @objc dynamic var price: Double = 0 }

Answer 1

保存领域对象必须位于领域区域内。

try? realm.write {
  //realm add
  //realm update
  //realm delete
}

保存领域对象时应用程序崩溃... RLMAccessor将对象设置为nil

1 个答案: